retain the last values

[Kyle]

I have been trying to get this input:

ID     VAR_1       VAR_2      VAR_3

001      1                              3    

001                    2

002                    2

002    1

002                     2               3

To this output:

ID     VAR_1       VAR_2     VAR_3

001     1               2               3

002     1               2               3

Here is my test dataset. I used RETAIN to get them all line up at the end, then take the LAST.ID. However the retain does not seem to work...

data a;

input id $ 1-3 var_1 $ 4-4 var_2 $ 5-5 var_3 $ 6-6;

cards;

0011 3

001 2

002 23

0021

002 3

;

Any ideas. Thanks!

-K

[Tom · Accepted solution]

Use the UPDATE statement.  Only non-missing values will cause changes to previous value.

data have ;
 input ID VAR_1 VAR_2 VAR_3 ;
cards;
001 1 . 3
001 . 2 .
002 . 2 .
002 1 . .
002 . 2 3
run;
data want ;
  update have (obs=0) have;
  by id;
run;
data _null_;
  set want ;
  put (_all_) (=);
run;

[Kyle]

Thanks Tom, that was quick